JP2000347633A - Optical control element and its driving method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a new type optical control element capable of displaying without a color filter and providing good visibility. SOLUTION: This optical control element includes a substrate 1 with a plurality of light output layers 4 arranged thereon and a substrate 2 having a light transmitting function arranged so as to face with each other, and supports a liquid crystal 3 between the substrate 1 and the substrate 2. A gate electrode 9 for applying a plurality of scanning signals to either of the substrates 1, 2 is formed, and a source electrode 10 for applying a plurality of signal electrodes to either of the substrates 1, 2 is formed. The light output layers 4 are arranged in a stripe shape and an arranging direction of the light output layers 4 corresponds to a direction of the gate electrode 9.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a novel light control element which can be used as a display element and the like, and more particularly to a light control element in which a liquid crystal element is combined and a driving method thereof.

[0002]

2. Description of the Related Art In recent years, liquid crystal displays have been widely used in televisions, videos, personal computers, word processors, projections, etc. due to their advantages such as low power consumption, thinness and light weight. However, even a liquid crystal display that has reached a practical level still has some problems.

First, light utilization efficiency is low. In the case of a normal color liquid crystal display, the light transmittance of the polarizing plate is 以下 or less, and the light transmittance of the color filter is １ ／ or less. Usage efficiency is 10% or less,
Usually, it is less than 5%. Since such low light utilization efficiency directly leads to an increase in power consumption,
Further response to the environment and energy is needed 2
Considering the first century, it must be said that it is a very big problem.

Therefore, several approaches have been taken to solve the above-mentioned problems. One of them is to provide a reflection type liquid crystal display which does not use a backlight and consumes no power of a backlight power supply. However, at the present stage, the contrast of the reflection type liquid crystal display device is as low as 20: 1 or less, and it is hard to say that the display is sufficient from the viewpoint of realizing a beautiful image in the true sense.

[0005] Another method is to use a backlight but display without using a color filter so as to prevent a decrease in light transmission efficiency due to the color filter. As a means for realizing this, a method using a phosphor called photoluminescent instead of a color filter has been proposed (WA Crossland et al., SID 97 Digest, 837 (1997)).
). However, in this method, there are still problems such as insufficient contrast and the possibility of damage to the liquid crystal material and the alignment film due to the use of UV light as a light source.

[0006] On the other hand, a field sequential color system using a backlight for temporally switching RGB colors has also been announced (T. Uchida et al., Proc. IDRC,
37 (1997)). However, in the case of this method, there remains a problem that a liquid crystal having a very high response speed is required.

Another problem of the liquid crystal display is that
Since the display is of the hold type, tailing and blurring of the outline occur when displaying a moving image, and the image quality is inferior to that of the impulse type CRT. On the other hand, recently, a liquid crystal display which performs an impulse type display has been proposed by IBM. However, even in this method, the response speed of the liquid crystal,
Issues remain such as the light emission and extinction speed of the backlight.

[0008]

Therefore, in order to solve the above-mentioned conventional low light utilization efficiency and low image quality, an organic EL (Electro Luminescent) corresponding to a pattern of a liquid crystal display element is used.
(Minescence) element has been developed to emit light, and it is also disclosed in, for example, Japanese Patent Application Laid-Open No. H8-211832. This technique will be described with reference to FIG.

As shown in FIG. 14, the composite device type display device disclosed in the above publication includes a liquid crystal display device 101 and an organic EL display device 102. In the liquid crystal display element portion 101, a sealing material 113 is provided so as to surround between opposing glass substrates 111 and 112, and the substrates 111 and 112 and the sealing material 113 are provided.
, The transparent electrodes X1,..., Xn, alignment film 114, liquid crystal 115, alignment film 116, and transparent electrode Y
1, to Yn are stacked.

On the other hand, the organic EL display element section 102 has transparent electrodes x1 to xn, a first hole injection layer 122a, and a second hole injection layer 122 under a glass substrate 121.
b, first organic EL layer 123a, second organic E layer
It has a structure in which an L light emitting layer 123b and electrodes y1 to yn are sequentially stacked.

As described above, according to the technique disclosed in the above publication, the organic EL display element section 102 is laminated on the liquid crystal display element section 101,
In addition, by driving these with one driving unit, the pixels of the liquid crystal element correspond to the pixels of the organic EL display element,
The same image is displayed on the liquid crystal display element unit 101 and the organic EL display element unit 102.

However, by stacking a matrix type liquid crystal display element and a matrix type organic EL element in this manner, the cost of manufacturing a panel is increased and the number of drive driver ICs is increased. There is a problem that it will be.

Further, since the transparent substrate is disposed between the two liquid crystal display elements and the organic EL display element, there is a problem in visibility when viewed obliquely. In order to solve this visibility, other problems arise, such as the need to reduce the aperture ratio and the use of a very thin transparent substrate which is disadvantageous in cost.

The present invention has been made in order to solve such a problem, and an object of the present invention is to provide a new type of light control element which performs display without using a color filter and has good visibility. I do. Still another object is to provide a light control element for performing impulse type display and a driving method thereof.

[0015]

In order to achieve the above object, a light control element according to the present invention comprises a first substrate on which at least one light output layer is disposed, a second substrate having a light transmitting function, Are opposed to each other, a liquid crystal is sandwiched between the first substrate and the second substrate, and an electrode for applying a plurality of scanning signals is formed on one of the first substrate and the second substrate. In a light control element in which an electrode for applying a plurality of signal electrodes is formed on one of a first substrate and a second substrate, the light output layers are arranged in a stripe shape, and the arrangement direction applies a scanning signal. It is characterized in that it coincides with the direction of the electrode.

Since the display is performed in response to the scanning signal,
The timing of scanning differs for each electrode to which a scanning signal is applied. In contrast, in the configuration of the present invention described above, the light output layer is arranged in a stripe shape so as to match the direction of the electrode to which the scanning signal is applied. Have been. Therefore, the light control element of the present invention can scan the light output layer at each scan timing. That is, the light emission timing can be changed for each light output layer corresponding to the electrode to which the scanning signal is applied, and an impulse type display can be realized.

Further, since the light output layer is incorporated,
The thickness can be reduced.

Further, by outputting light having different wavelengths, for example, RGB light, for each light output layer arranged in a stripe shape, it is possible to perform color display without using a color filter. Therefore, it is possible to prevent a reduction in light transmission efficiency due to the color filter and realize low power consumption.

As a result, it is possible to achieve a reduction in thickness, weight, and power consumption, and furthermore, it is possible to prevent tailing and blurring of contours generated when displaying moving images by impulse-type display, thereby improving image quality. .

Further, in the light control element of the present invention, the first substrate on which at least one light output layer is disposed is opposed to the second substrate having a light transmitting function, and the first substrate and the second substrate A liquid crystal is sandwiched between the first substrate and the second substrate.
A plurality of active elements are formed on any of the substrates,
A gate electrode for applying a plurality of scanning signals to one of the first substrate and the second substrate, and a source electrode for applying a plurality of signal electrodes to one of the first substrate and the second substrate Is formed, and the light output layers are arranged in a stripe shape, and the arrangement direction coincides with the direction of the gate electrode.

According to the above configuration, since the light output layers are arranged in a stripe shape in accordance with the direction of the gate electrode to which the scanning signal is applied, the light output layers can be scanned at each scanning timing. Becomes That is, the timing of light emission can be changed for each light output layer corresponding to the gate electrode to which the scanning signal is applied, and an impulse type display can be realized.

Further, since the light output layer is incorporated,
The thickness can be reduced.

Further, by outputting light having different wavelengths, for example, RGB light, for each light output layer arranged in a stripe pattern, color display can be performed without using a color filter. Therefore, it is possible to prevent a reduction in light transmission efficiency due to the color filter and realize low power consumption.

As a result, it is possible to achieve a reduction in thickness, weight, and power consumption, and furthermore, it is possible to prevent tailing and blurring of contours generated when displaying moving images by impulse-type display, thereby improving image quality. .

Further, in the light control element of the present invention, it is preferable that the active element is formed on the second substrate.

For example, when manufacturing an active element such as a TFT, the process temperature is high. Therefore, as described above, by forming the active element on the second substrate instead of the first substrate on which the light output layer is disposed, a problem due to a thermal process is less likely to occur. Furthermore, since the yield of the light output layer and the active element hardly becomes 100%, if both are manufactured on the same substrate, the yield will decrease. Thus, by arranging the first substrate and the second substrate separately as in the above configuration, it is possible to suppress a decrease in yield.

[0027] Preferably, a layer having a polarizing function is formed on the first substrate. With this configuration, for example, when an active element is manufactured on the second substrate, it is possible to suppress the occurrence of a problem due to a thermal process.

Further, the light control element of the present invention is characterized in that:
The light output layer formed on the substrate of
L, and a light-emitting layer composed of at least one of the light-emitting elements of the FED. A first electrode film, the light-emitting layer, and a second electrode film are formed in this order on a first substrate. The light emitting layer preferably emits light when a voltage is applied between the first electrode film and the second electrode film.

Since the thickness of the light emitting layer having the above structure can be reduced, the thickness of the entire light control element can be reduced.

Further, the light control element of the present invention is characterized in that:
It is preferable that the light output layer formed on the substrate is composed of a combination of an optical waveguide and a light source coupled to the optical waveguide and arranged in the non-display area.

According to the above configuration, a light emitting portion (light source) is provided on a part of the substrate, and light emitted from the light emitting portion (light source) can be guided to an output portion formed in a stripe shape by an optical waveguide. can do.

Further, the driving method of the light control element of the present invention is as follows.
The light control element described above is characterized in that the light emission time of the light output layer is 5% or more and 70% or less of each display frame time.

By limiting the time of light emission from the light output layer as described above, a high-quality moving image display without contour blur or tailing can be realized while maintaining the characteristics of the impulse type display. And the display brightness can be kept high.

Further, it is more preferable that the light emission time of the light output layer is 15% or more and 40% or less of each display frame time.

Further, by limiting the light emission time from the light output layer as described above, it is possible to reliably realize a high-quality moving image display without contour blur and tailing while maintaining the characteristics of the impulse type display. In addition, the brightness of the display can be reliably kept high.

Further, the driving method of the light control element of the present invention is as follows.
In the above-described light control element, after sending a scanning signal to each scanning line, light is output from the light output layer after a predetermined time, and the light output is terminated before the next scanning signal is sent. You can also.

According to the above method, scanning of the light output layer is performed by
This can be performed in accordance with the scanning signal for each scanning line, that is, the light output layer can emit light in synchronization with the scanning timing. Thereby, an impulse-type display can be realized.

Further, a preferable driving method of the light control element is a method in which a plurality of light output layers having different wavelengths are collectively emitted at the same time.

According to the above method, an IC for controlling
Can be reduced.

Further, in the driving method of the light control element of the present invention, it is preferable that the wavelength of the arranged light output is different between the adjacent light output layers, and furthermore, the colors of the light output layers are R, G, It is preferable that these are periodically repeated in any of B.

According to the above-described method, color display without using a color filter can be performed, so that light use efficiency can be increased and power consumption can be reduced.

[0042]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, details of the present invention will be described.
This will be described with reference to the drawings. FIG. 1A is a plan view and a sectional view of a light control element according to a first embodiment of the present invention.
And (b).

As shown in the cross-sectional view of FIG. 1B, a liquid crystal 3 is interposed between a substrate 1 and a substrate 2 made of glass which are arranged to face each other.
Are sandwiched, and a plurality of light output layers 4 are formed on the substrate 1 in a stripe shape. As the substrate 1, besides the glass substrate,
A silicon substrate, a plastic substrate, or the like can be used. Further, as the substrate 2 facing the substrate 1, a transparent substrate such as a plastic substrate can be used in addition to a glass substrate.

The light output layer 4 is made of an organic EL (Electro
Luminescence element, inorganic EL (E-lectro Luminescenc)
e) A light-emitting element (light-emitting body) such as an element or an FED (Field Emission Diode) can be used. And the substrate 1
On top of this, a metal electrode 5, a light emitting layer 6 made of an organic EL element or the like,
A transparent electrode 7 such as a TO electrode is laminated. These metal electrode 5, light emitting layer 6, and transparent electrode 7 can all be formed by patterning processing by photolithography or the like. Further, a polarizing function layer 13 is provided on the transparent electrode 7.
Are provided, and an alignment film 15 is further provided. FIG.
The plan view of (a) shows a structural view obtained by patterning.

When the light emitting layer 6 is formed on the entire surface of the substrate 1, a film having a polarization function is formed on the light emitting layer 6,
The liquid crystal layer 3 may be directly disposed on the film.

FIGS. 2A and 2B are a plan view and a sectional view of a light control element according to a second embodiment of the present invention. As in the structure of the second embodiment, it is also possible to use an optical waveguide 16 functioning as an optical output layer and adopt a light control element structure in which the optical waveguide 16 is coupled to an external light source 17. The optical waveguide 16 has P
It can be formed of MMA (Polymethyl methacrylate) or the like. In addition, as the external light source 17, a light emitting element such as a semiconductor laser diode, an inorganic EL element, an organic EL element, and a fluorescent lamp can be used.

In the first and second embodiments, when a single color is emitted from the light output layer (the light output layer 4 and the light guide 16) or the light source 17, the display is a monochrome display. By emitting light of different wavelengths from the plurality of light output layers (light output layer 4 and light guide 16) or light source 17, colorization of the display becomes possible. In particular, it is preferable to output RGB light for each of a plurality of light output layers (light output layer 4 and optical waveguide 16) or light sources 17 arranged in stripes. As a result, color display without a color filter used in a conventional liquid crystal display device can be performed, light use efficiency can be increased, and power consumption can be reduced. Furthermore, since there is no backlight, a thin and lightweight display can be realized.

Further, as a liquid crystal material used for the liquid crystal 3 sandwiched between the substrates 1 and 2, nematic liquid crystal, ferroelectric liquid crystal, antiferroelectric liquid crystal, polymer composite liquid crystal, or the like can be used.

In the case of a matrix type organic EL element, when the display capacity is increased and the duty ratio is increased, there is a problem that it is difficult to increase the luminance and contrast. In the present invention, however, the driving of the organic EL element is basically performed. In addition, it is a static drive, and good characteristics are easily obtained. Further, since the transmitted light intensity of the light can be controlled in the liquid crystal portion, good display performance can be realized as a whole.

Since an electric field applying means is required to drive the liquid crystal 3, electrodes are formed on one or both of the substrate 1 and the substrate 2. Specifically, an electrode for applying a plurality of scanning signals is formed on one of the substrate 1 and the substrate 2, and an electrode for applying a plurality of signal electrodes is formed on either the substrate 1 or the substrate 2.

In the light control element according to the first embodiment shown in FIG. 1, an example is shown in which the liquid crystal 3 is driven by TFT driving. That is, the TFTs 8 are arranged on the substrate 2, and each TFT 8 is connected by the scanning electrode (gate electrode) 9 and the signal electrode (source electrode) 10. A pixel electrode 12 made of an ITO film is formed in each pixel, and a counter electrode 11 made of an ITO film is formed on the substrate 1.

When an active element such as a TFT 8 is manufactured, it is preferable to dispose it on the substrate 2 side rather than on the substrate 1 side. There are two main reasons. The first is that since the process temperature for manufacturing the TFT 8 is high, the substrate 2 made of glass is less likely to cause a problem due to a thermal process than the substrate 1 on which the polarization function layer 13 and the like are formed. Second, the yield of the light output layer 4 (including the optical waveguide 16) composed of the organic EL element (the light emitting layer 6) and the TFT 8 is 100%.
%, The yield is reduced by the product of both yields if both are formed on the same substrate. However, if they are separately formed on the substrates 1 and 2, by combining only non-defective substrates, The point is that a high yield can be realized.

FIG. 1 shows a TFT driven liquid crystal element which is an active drive as described above. However, a simple matrix type display using no TFT 8, a MIM (Metal Insulato
Needless to say, it can also be driven by a method using an rM-etal) display, a method using a silicon substrate, or the like.

As a general means for modulating the light intensity with the liquid crystal, in the light control element according to the first embodiment of the present invention shown in FIG. And the polarizing plate 14 are arranged. In the light control element according to the second embodiment of the present invention shown in FIG.
A polarizing plate is used, and a polarizing plate 14 is further disposed. However, these can be omitted depending on the type of the liquid crystal to be sandwiched. For example, a layer having a polarizing function (including a polarizing plate) may be omitted in a polymer dispersion type or guest-host type liquid crystal.

In addition to using a normal polarizing plate as the polarizing function layer 13, there is also a method of coating and forming a polarizing film. As a forming method, first, an alignment film is formed, and the alignment film is rubbed. Next, a reactive liquid crystal polymer mixed with a dichroic dye is applied on the alignment film. Thereby, the reactive liquid crystal polymer and the mixed dichroic dye are arranged in one direction. Next, the polymer is polymerized by light irradiation. This fixes the arrangement in one direction. The alignment film 15 can be further formed on the polarizing film thus formed, and the configuration as shown in FIG. 1 is possible. In this configuration, light emitted from the light output layer 4 enters the liquid crystal 3, and the light is emitted from the substrate 2 by controlling the liquid crystal portion with an electric field to change the state of light of each pixel. .

Next, the light output timing from the light output layer 4 when the display according to the first embodiment (shown in FIG. 1) is used will be described. An embodiment will be described below. The light from the light output layer 4 may be constantly emitted, but in this case, a display of a hold type is provided. However, by outputting light only during a certain period in the frame, an impulse-type display can be realized.

This impulse type display will be described with reference to FIGS. 3 and 4 by taking a TFT drive type display as an example. FIG. 3 is a layout diagram of the TFT driving elements of the display, and FIG. 4 is a waveform diagram of each signal at the time of the impulse type display in the third embodiment.

Gate electrode (scanning electrode) 9 (FIGS. 3 and 4)
, G1, G2, G3,...)
Signal and turn on the gate. In synchronization with this, a data signal corresponding to the display state required by the pixel is applied to the source electrode (signal electrode) 10 (S1, S1 in FIGS. 3 and 4).
(Indicated by S2, S3,...)), Matrix display is performed, and the amount of light transmission is controlled according to the voltage applied to the pixel. In this case (FIG. 4), the description will be made on the assumption that the TFT driving element has n gate electrodes. While a signal is sent from each of the electrodes 9 and 10 and the display content is sent to the liquid crystal portion, the light output layer 4
Does not emit light. Then, after the liquid crystal portion is in a state corresponding to the display content, that is, after the liquid crystal 3 has sufficiently responded to a signal, light is emitted from the light output layer 4. This makes it possible to realize an impulse type display.

Here, the time of light emission from the light output layer 4 will be further considered. Preferably, it is 5% or more and 70% or less of each display frame time, and more preferably 15% or less.
% Or more and 40% or less. That is, if the light emission period is longer than 70% of the frame time, the characteristic of the impulse type display is weakened, and the degree of contour blur and tailing approaches the hold type. It is more preferably at most 40%.

From one display frame of 16.7 ms,
The result obtained by subtracting the writing time (the gate ON time per scanning line × the number of scanning lines) of the TFT 8 and the response time of the liquid crystal 3 can be used as the light emitting period (the liquid crystal 3 becomes a state corresponding to all display information). 70
If the light emission period is to be as long as%, the response speed of the liquid crystal 3 and the writing speed of the TFT 8 are greatly restricted. If the light emission period is less than 5% of the frame time, it is difficult to increase the brightness of the display. For example, in the case of 5%, in order to obtain the same brightness as in the case where light is emitted for the entire period, a light emission intensity of 20 times is required. Therefore, more preferably, 15
% Or more.

For example, the metal electrode 5 and the transparent electrode 7 shown in FIG.
The pattern may or may not be patterned, but the cost is lower if no patterning is performed. In addition, even if it is patterned, it is not necessary to drive each separately, and by using a light emitting pattern as shown in FIG.
By applying a voltage to all the electrodes collectively, light can be emitted from the entire surface at the same time.

As another example, the light output timing from the light output layer 4 when the above-described display is used is examined as different from the light output timing of the third embodiment. The fourth embodiment will be described below. The light output timing is a method of changing the light emission period of the light output layer 4.

A TFT driven display will be described as an example with reference to FIG. 3 and FIG. FIG. 5 is a waveform diagram of each signal showing the light output timing of the impulse type display in the fourth embodiment.

The gate electrode (scanning electrode) 9 (FIGS. 3 and 5)
, G1, G2, G3,...)
Signal and turn on the gate. In synchronization with this, a data signal corresponding to the display state desired by the pixel is applied to the source electrode (signal electrode) 10 (S1, S in FIGS. 3 and 5).
, S3,...) For matrix display. The light transmission amount is controlled according to the voltage applied to the pixel. After the gate is turned off, light is output from the light emitting layer 6 after a certain time. In this way, as shown in FIG. 5, it is possible to realize an impulse-type display in which the light emission timing is changed for each line.

In order to perform an impulse type display as described in the fourth embodiment, the light output layers 4 are arranged in a stripe shape, and the arrangement direction is the electrode (gate electrode 9) to which a scanning signal is applied. It is necessary to match the direction. Since the display content of the liquid crystal display portion is displayed in accordance with the scanning signal, and the scanning timing is different for each scanning line, it is necessary to change the timing of the light emitting layer 6 corresponding thereto. As the scanning of the light emitting layer 6, three or more light emitting layers may be collectively emitted. In any case, it is necessary to make the light emission time equal for each line, and to extinguish the light before turning on the next gate. The great advantage of this method is that the response speed of the liquid crystal 3 may be slower than that of the third embodiment, and the light emission period can be made longer, so that the brightness as a display increases. is there.

That is, in the case of the method of the third embodiment, since the liquid crystal 3 emits light only when the liquid crystal 3 is in a state corresponding to all display information, the writing time in the TFT 8 from 16.7 ms (per one scanning line) Of the liquid crystal 3 and the response time of the liquid crystal 3 can be used as the light emission period.

On the other hand, when the timing of the light output layer 4 is changed for each scanning line by the method described in the fourth embodiment, in principle, the number of gates per scanning line can be reduced from 16.7 ms. The value obtained by subtracting the ON time and the response time of the liquid crystal 3 can be used as the light emission period. Therefore, the restriction on the response time of the liquid crystal 3 is less strict than in the third embodiment. In addition, liquid crystal 3
If the response speeds are the same, the light emission time can be longer in the fourth embodiment, and the luminance as a display is improved.

It is preferable that the light emission time from the light output layer 4 is not less than 5% and not more than 70% of each display frame time. More preferably, it is 15% or more and 40% or less. The reason is as described above.

When the timing is changed for each light output layer 4 corresponding to one scanning line, it is necessary to control each light output layer 4 separately. Therefore, for example, in the configuration of FIG. 1, since the metal electrode 5 corresponds to the gate electrode 9, the metal electrode 5 needs to be patterned corresponding to the light output layer 4. The transparent electrode 7 as the other electrode constituting the light output layer 4 may or may not be patterned.

In the case where the light output layer 4 has a repetition of RGB, it is a good method to emit light of three RGB at once. This is because it is preferable that the light emission period is the same because three display components of RGB are one display unit.
In the case of emitting and extinguishing three lines at a time, three lines may be controlled together.

The same applies to the case where more than three lines are collectively controlled. As the number of ICs is increased, there are merits that the pattern becomes rougher and easier to produce, and the number of ICs for control is reduced.

Further, RGB can be arranged as shown in FIGS. 8 (a) and 8 (b). By arranging in this way, RGB can be output from the light output layer 4 corresponding to a certain gate.
Can be simultaneously emitted. A signal corresponding to each RGB pixel is input from the source electrode 10. Further, a configuration as shown in FIGS. 9A and 9B may be adopted.
8A and 9A are plan views showing the structure of the light control element, and FIG. 8B is a cross-sectional view thereof. still,
In FIG. 9B, reference numeral 20 denotes a glass substrate.

In the present embodiment, the TFT-driven liquid crystal has been described as an example of the liquid crystal element portion, but it is needless to say that another liquid crystal (for example, a ferroelectric liquid crystal, an antiferroelectric liquid crystal, PDLC, etc.) may be used. A specific example according to the above embodiment will be described below.

[0074]

EXAMPLES (Example 1) The first example of the present invention is a specific example of the light control element according to the first embodiment. Hereinafter, a first embodiment of the present invention will be described with reference to FIG.
It will be described based on.

A metal electrode 5 is formed on a substrate 1 made of glass and patterned in a stripe shape. An organic EL layer is formed thereon as the light emitting layer 6. Here, as the organic EL layer, a layer that emits light of each color of RGB is formed one by one. Furthermore, on top of that, a non-patterned ITO
A transparent electrode 7 made of a film is formed.

The polarization function layer 13 is formed on the transparent electrode 7. In the formation method, an alignment film (omitted in FIG. 1) is formed, the alignment film is rubbed, and a reactive liquid crystal polymer mixed with a dichroic dye is applied on the alignment film. Thereby, the reactive liquid crystal polymer and the mixed dichroic dye are arranged in one direction. Next, when the polymer is polymerized by light irradiation, the polymer is fixed in a state of being arranged in one direction, and becomes the polarization functional layer 13 which is a film having a polarization function. Further, the counter electrode 11 is formed on the entire surface of the polarization function layer 13.
To form an ITO film, and further apply an alignment film 15,
Rub.

On the other hand, TFTs 8 and wirings connecting them are formed on the substrate 2. Each TFT 8 is connected by a scanning electrode (gate electrode) 9 and a signal electrode (source electrode) 10. Further, a pixel electrode 12 made of an ITO film is formed for each pixel.

Next, the substrate 1 and the substrate 2 manufactured as described above are bonded together, a nematic liquid crystal for TN type display is injected, and the periphery is sealed. Here, it is important that one of the scanning electrode (gate electrode) 9 and the signal electrode (source electrode) 10 coincides with the stripe arrangement direction of the light output layer 4. In the first embodiment, the scanning electrode (gate electrode) 9 is formed so as to coincide with the stripe arrangement direction of the light output layer 4.

(Embodiment 2) A second embodiment of the present invention will be described with reference to FIG. FIG. 6 is a cross-sectional view illustrating a structure of the light control element according to the present embodiment.

The light control element according to the present embodiment has the light output layer 4
A substrate 1 made of glass on which is disposed and a substrate 2 made of glass on which a TFT 8 is formed are arranged to face each other, and a liquid crystal 3 is arranged between the substrates 1 and 2.

More specifically, on the surface of the substrate 1 made of glass, a transparent electrode 7 made of an ITO film is arranged on the side opposite to the side where the liquid crystal 3 is arranged, and the light emitting layer 6 is formed on the transparent electrode 7. An organic EL layer is provided in a stripe shape, and a metal electrode 5 which is not patterned is provided on the light emitting layer 6. On the other surface of the substrate 1, a polarizing function layer 13 (here, a polarizing plate is used, so hereinafter referred to as a polarizing plate 13 in this embodiment) is disposed. Is provided with a counter electrode 11 made of an ITO film. Further, an alignment film 15 for aligning the liquid crystal 3 is provided on the counter electrode 11.

On the other hand, on the surface of the substrate 2 made of glass on the side where the liquid crystal 3 is arranged, TFTs 8 and wirings connecting the TFTs 8 are arranged. Each TFT 8 is connected by a scanning electrode (gate electrode) 9 and a signal electrode (source electrode) (not shown in FIG. 6). In addition, ITO for each pixel
A pixel electrode 12 made of a film is arranged, and an alignment film 15 is further provided thereon. A polarizing plate 14 is disposed on the other surface of the substrate 2.

As the liquid crystal material of the liquid crystal 3, a nematic liquid crystal for TN mode display is used. Note that it is important to match either the scanning electrode (gate electrode) 9 or the signal electrode (source electrode) (not shown in FIG. 6) with the stripe arrangement direction of the light output layer. In the above, the stripe arrangement directions of the scanning electrode (gate electrode) 9 and the light output layer 4 are matched.

Next, a specific procedure for manufacturing the cell shown in FIG. 6 will be described. The methods can be roughly divided into the following two methods. (1) After forming the organic EL layer, a TFT substrate is bonded. (2) After bonding the TFT substrates, an organic EL layer is formed.

Hereinafter, these methods will be described in detail.
The TFT substrate is a substrate on which the TFT 8, the gate electrode 9, the source electrode 10, the pixel electrode 12, the alignment film 15, and the like are formed on the substrate 2.

First, (1) After forming the organic EL layer, T
A method of attaching the FT substrate will be described with reference to FIGS.

First, as a first step, an organic E is placed on one surface of a glass substrate 1 (see FIG. 10A).
An ITO film is formed as a drive electrode (transparent electrode 7) for the L element (light output layer 4), and a pattern is formed by a photo process (see FIG. 10B). Note that the substrate 1 is preferably as thin as possible to enable good display without parallax.

Next, as a second step, a polarizing plate 13 is formed on the other surface of the substrate 1 (see FIG. 10C), and a counter electrode 11 for driving a liquid crystal is formed thereon by an ITO film. It is formed (see FIG. 10D). In the second step, after the counter electrode 11 for driving the liquid crystal is formed, the polarizing plate 1 is formed.
3 may be formed.

Next, as a third step, an alignment film 15 for aligning the liquid crystal 3 is formed on the counter electrode 11 and rubbing is performed (see FIG. 10E). As the alignment film 15, it is preferable to use a material that can be formed by low-temperature baking in consideration of the polarizing plate 13 formed earlier. Next, if necessary, a laminate film 18 for protecting the alignment film 15 is attached (see FIG. 10F).

Next, as a fourth step, an organic EL layer was formed as a light emitting layer 6 in a stripe shape on the transparent electrode 7 (see FIG. 10G), and then the organic EL element (light output layer 4). The metal electrode 5 which is the cathode of the driving electrode is formed (see FIG. 10H). After that, it is preferable that the light emitting layer 6 side is covered with a sealing substrate (not shown). This is to prevent deterioration of the organic EL. The light-emitting layer 6 is formed of a layer that emits RGB light for each line.

Next, as a fifth step, a TFT substrate is bonded (see FIG. 11A). At this time, if the laminate film 18 for protecting the alignment film is adhered, it is peeled off and then adhered to the TFT substrate. In the description of the third step, rubbing is performed before the lamination of the laminate film 18, but rubbing can be performed after the lamination of the laminate film 18.

As a sixth step, after that, a polarizing plate 14 is formed on the substrate 2 and, after the bonding of the substrates, a nematic liquid crystal for TN-type display is injected as the liquid crystal 3 (FIG. 11).
(B)). At this time, if vacuum injection is performed while the light emitting layer 6 side is covered with the sealing substrate, the sealing substrate may be broken by the internal pressure. For this reason, when injecting a liquid crystal material, it is preferable to inject while performing evacuation from the opposite side of the liquid crystal injection port. Also, when bonding the TFT substrate, the liquid crystal material is dropped in advance and the TFT
Bonding substrates, so-called drop injection, is also an effective means.

Next, (2) a method of forming an organic EL layer after bonding a TFT substrate will be described with reference to FIGS.

First, as a first step, an organic E is placed on one surface of a glass substrate 1 (see FIG. 12A).
An ITO film is formed as a drive electrode (transparent electrode 7) of the L element (light output layer 4), and a pattern is formed by a photo process (see FIG. 12B). Note that the substrate 1 is preferably as thin as possible to enable good display without parallax.

Next, as a second step, a polarizing plate 13 is formed on the other surface of the substrate 1 (see FIG. 12C), and a counter electrode 11 for driving a liquid crystal is formed thereon by an ITO film. It is formed (see FIG. 12D). In the second step, after the counter electrode 11 for driving the liquid crystal is formed, the polarizing plate 1 is formed.
3 may be formed.

Next, as a third step, an alignment film 15 for aligning the liquid crystal 3 is formed on the counter electrode 11 and rubbing is performed (see FIG. 12E). As the alignment film 15, it is preferable to use a material that can be formed by low-temperature baking in consideration of the polarizing plate 13 formed earlier.

Next, a TFT substrate is bonded as a fourth step (see FIG. 13A).

Next, as a fifth step, an organic EL layer as the light emitting layer 6 is formed on the transparent electrode 7 (FIG. 13B).
reference). If it is necessary to clean the transparent electrode 7 before formation, it is necessary to close the liquid crystal injection port so that the cleaning liquid does not enter between the transparent electrode 7 and the alignment film 15. Then, when forming an organic EL layer by vapor deposition, it is necessary to put the whole in a chamber and to make it vacuum. At this time, if the entrance is blocked, the substrate may be broken by the internal pressure. For this reason, it is necessary to remove the object blocking the inlet. After forming the organic EL layer, a metal electrode 5 which is a cathode of a driving electrode of the organic EL element (light output layer 4) is formed (see FIG. 13B). Thereafter, it is desirable that the light emitting layer 6 side be covered with a sealing substrate (not shown). This is to prevent deterioration of the organic EL layer.

Finally, in a sixth step, after forming the polarizing plate 14 on the substrate 2, a nematic liquid crystal for TN display is injected as the liquid crystal 3 (see FIG. 13C). At this time, if vacuum injection is performed while the light emitting layer 6 side is covered with the sealing substrate, the sealing substrate may be broken by the internal pressure. For this reason, when injecting a liquid crystal material, it is preferable to inject while performing evacuation from the opposite side of the liquid crystal injection port.

(Embodiment 3) A third embodiment of the present invention will be described with reference to FIG. FIG. 7 is a cross-sectional view illustrating the structure of the light control element according to the present embodiment.

The light control element according to the present embodiment is different from the light control element according to the second embodiment in that
A configuration in which a substrate 20 made of glass is further disposed between the counter electrode 11 and the counter electrode 11 (hereinafter, a polarizing plate is used in this embodiment because a polarizing plate is used in this embodiment). It has become. Other configurations are the same as those of the light control element according to the second embodiment.

A method for manufacturing the light control element according to this embodiment will be described below.

First, a transparent electrode 7 is formed of an ITO film on a substrate 1 made of glass, and is patterned in a stripe shape. After that, an organic EL layer is formed as the light emitting layer 6. Here, the light-emitting layer 6 is formed of a layer that emits RGB light for each line. Further, a metal electrode 5 that is not patterned is formed thereon. Further, the counter electrode 11 is formed on the entire surface of the glass substrate 20 with an ITO film, and thereafter, an alignment film 15 for aligning the liquid crystal 3 is applied on the counter electrode 11 and rubbed.

On the substrate 2, TFTs 8 and wirings connecting them are formed. Each TFT 8 is connected to a scanning electrode (gate electrode) 9 and a signal electrode (source electrode) (not shown in FIG. 7). In addition, each pixel has an IT
A pixel electrode 12 made of an O film is formed.

Next, the substrate 2 manufactured as described above and the glass substrate 20 are bonded together, and a nematic liquid crystal for TN-type display is injected between them, and the periphery is sealed. Glass substrate 2
The polarizing plate 13 is formed on the surface of the liquid crystal 3 on the side opposite to the liquid crystal 3, and the substrate 1 is bonded on the polarizing plate 13. Here, it is important that either the scanning electrode (gate electrode) 9 or the signal electrode (source electrode) (not shown in FIG. 7) match the stripe arrangement direction of the light output layer 4. Therefore, in the third embodiment, the stripe arrangement directions of the scanning electrode (gate electrode) 9 and the light output layer 4 are matched.

(Embodiment 4) As a fourth embodiment of the present invention, a case where the light control element shown in FIG. 1 is driven by an impulse type display method as shown in FIG. explain.

In the driving method according to the present embodiment, signals are sequentially transmitted from the gate electrodes (scanning electrodes G1, G2, G3,...) To turn on the gate. In synchronization with this, a data signal corresponding to the display state required by the pixel is sent from the source electrode (signal electrode S1, S2, S3,. Examples of the voltage applied to the pixel are shown for the pixels (G1-S1, G2-S1,...). The light transmission amount is controlled according to the voltage applied to the pixel.
In the display method shown in FIG. 4, the TFT 8 is illustrated as having n gate electrodes. The light output layer 4 is not illuminated while a signal is sent from the electrode and the display content is sent to the liquid crystal portion. Then, after the liquid crystal portion is in a state corresponding to the display content (after the liquid crystal has sufficiently responded to the signal), light is emitted from the light output layer 4. In this way, an impulse-type display is realized.

(Embodiment 5) As a fifth embodiment of the present invention, the light control element shown in FIG. 1 is replaced with an impulse for changing the light emission period of the light output layer 4 as shown in FIG. A case of driving by a mold display method will be described.

The gate electrodes (scanning electrodes G1, G2, G3,
…)) To turn on the gate. In synchronization with this, a data signal corresponding to the display state required by the pixel is sent from the source electrodes (signal electrodes S1, S2, S3,...) To perform matrix display. Examples of voltages applied to the pixels are shown for the pixels (G1-S1, G2-S1,...). The light transmission amount is controlled according to the voltage applied to the pixel. The light is output from the light emitting layer 6 after a certain period of time after the gate is turned off (indicated by OP1 in FIG. 5). That is, for each gate line, the gate signal is turned off, and after the liquid crystal 3 sufficiently responds to this voltage, the light emitting layer 6 corresponding to the gate line emits light. By driving in this way,
As shown in FIG. 5, an impulse-type display is realized.

Here, the arrangement direction of the stripes of the light output layer 4 matches the direction of the electrode (gate electrode 9) to which the scanning signal is applied. The display content of the liquid crystal display portion is displayed in response to the scanning signal, and the scanning timing is set to RG.
B is different for each scanning line. The timing of the light emitting layer 6 changes accordingly.

(Embodiment 6) As a sixth embodiment of the present invention, a driving method in which the light emission timing of the light output layer 4 in the fifth embodiment is made different from the light emission timing will be described below. The light emission timing of the light output layer 4 in the present driving method is such that the light output layer 4 is a repetition of RGB as indicated by OP2 in FIG. It is to let. And
In one set of RGB, the light emission time is equal for each line, and the light is extinguished before the next gate is turned on. Further, R
Since three sets of GB constitute one set of display units, when the light emission period is the same and light emission and extinction are performed, it is possible to send and control three signals collectively.

With this structure, the light emitting layer 4
Can be reduced, and the line-sequential driving type impulse display can be performed.

Furthermore, it is also possible to control more than three at once. As a large number of devices are driven together, the electrode and the light emitting layer pattern become rougher, so that a display device can be easily manufactured, and there is an advantage that the number of ICs for controlling can be reduced.

(Embodiment 7) Next, regarding the light output layer 4,
A seventh embodiment having a configuration different from the configuration shown in FIG. 1 will be described with reference to FIG.

An optical waveguide 16 is formed as an optical output layer on a substrate 1 made of glass, and a light source 17 optically coupled to the optical waveguide 16 is disposed outside the configuration of the display section. In this embodiment, an example in which an organic EL is used as the light emitting layer 6 of the light source 17 is shown.

Next, an alignment film (omitted in FIG. 2) is formed.
The alignment film is rubbed, and a reactive liquid crystal polymer mixed with a dichroic dye is applied on the alignment film. Thereby, the reactive liquid crystal polymer and the mixed dichroic dye are arranged in one direction. Next, by polymerizing the polymer by light irradiation, the state in which the polymer is arranged in one direction is fixed, and the polarizing function layer 13 (in this embodiment, a polarizing plate is used. It is described as a polarizing plate 13.)
become. Further, the counter electrode 11 is formed of an ITO film on the polarizing plate 13 and is patterned into a predetermined shape. Further, an orientation film 15 is applied and rubbed.

On the other hand, the pixel electrode 12 is formed by patterning the ITO film on the substrate 2. Next, the above-prepared substrate 1 and substrate 2 are bonded together, and an antiferroelectric liquid crystal is injected as the liquid crystal 3. Here, one of the scanning electrode (gate electrode) and the signal electrode (source electrode) (both electrodes are not shown in FIG. 2) is aligned with the stripe arrangement direction of the optical waveguide 16 functioning as an optical output layer. This is very important. In this embodiment, the scanning electrodes (gate electrodes) are aligned with the stripe arrangement direction of the optical waveguide 16.

[0118]

As described above, the light control element according to the present invention has a structure in which the light output layers are arranged in a stripe shape, and the arrangement direction coincides with the direction of the electrode to which the scanning signal is applied.

Therefore, the timing of light emission can be changed for each light output layer corresponding to the electrode to which the scanning signal is applied, and an impulse type display can be realized. Further, since the light output layer is incorporated, the problem of the light emission / extinction speed due to the use of the backlight can be solved, and furthermore, a reduction in thickness, weight, and power consumption can be realized. Further, by outputting light having different wavelengths for each light output layer arranged in a stripe shape, color display can be performed without using a color filter. Therefore, it is possible to prevent a reduction in light transmission efficiency due to the color filter and to realize low power consumption. As a result, it is possible to reduce the thickness, weight, and power consumption, and also improve the image quality by preventing tailing and blurring of outlines that occur when displaying moving images with impulse-type display. Play.

Further, in the light control element according to the present invention, the first substrate on which at least one light output layer is disposed and the second substrate having a light transmitting function are opposed to each other, and A liquid crystal is sandwiched between the first substrate and the second substrate, a plurality of active elements are formed on one of the first substrate and the second substrate, and a plurality of active elements are formed on one of the first substrate and the second substrate. A gate electrode for applying a scanning signal is formed;
A source electrode for applying a plurality of signal electrodes is formed on one of the substrate and the second substrate, the light output layers are arranged in a stripe shape, and the arrangement direction coincides with the direction of the gate electrode. You can also.

Therefore, the light emission timing can be changed for each light output layer corresponding to the gate electrode to which the scanning signal is applied, and an impulse type display can be realized. Further, since the light output layer is incorporated, the problem of the light emission / extinction speed due to the use of the backlight can be solved, and furthermore, a reduction in thickness, weight, and power consumption can be realized. Further, by outputting light having different wavelengths for each light output layer arranged in a stripe shape, color display can be performed without using a color filter. Therefore, it is possible to prevent a reduction in light transmission efficiency due to the color filter and to realize low power consumption. As a result, it is possible to reduce the thickness, weight, and power consumption, and also improve the image quality by preventing tailing and blurring of outlines that occur when displaying moving images by impulse-type display. Play.

Further, the light control element according to the present invention preferably has a configuration in which the active element is formed on a second substrate.

As a result, there is an effect that a problem due to the thermal process hardly occurs, and a decrease in the yield can be suppressed.

Preferably, a layer having a polarizing function is formed on the first substrate. This allows
For example, when the active element is manufactured on the second substrate, it is possible to suppress an occurrence of a problem due to a thermal process.

Further, in the light control element according to the present invention, the light output layer formed on the first substrate may be a light emitting layer comprising at least one of organic EL, inorganic EL, and FED light emitters. The first electrode film, the light emitting layer, and the second electrode film are formed in this order on a first substrate, and a voltage is applied between the first electrode film and the second electrode film. Is preferably applied so that the light emitting layer emits light.

As a result, there is an effect that the thickness of the entire light control element can be reduced.

Further, in the light control element according to the present invention, the light output layer formed on the first substrate may include an optical waveguide, and a light source coupled to the optical waveguide and arranged in a non-display area. It is preferred to be constituted by a combination of

As a result, there is an effect that the weight can be further reduced.

Further, in the driving method of the light control element according to the present invention, in the above-described light control element, it is preferable that the light emission time of the light output layer is not less than 5% and not more than 70% of each display frame time.

Therefore, it is possible to realize a high-quality moving image display without contour blurring or tailing while maintaining the characteristics of the impulse type display, and it is possible to maintain a high display brightness.

Further, in the driving method of the light control element according to the present invention, the light emission time of the light output layer is set to one of the display frame times.
More preferably, it is set to 5% or more and 40% or less.

Therefore, it is possible to achieve a high-quality moving image display without contour blur or tailing while maintaining the characteristics of the impulse-type display, and to ensure that the display brightness can be maintained at a high level.

Further, in the driving method of the light control element according to the present invention, in the light control element described above, after a scanning signal is sent to each scanning line, light is output from the light output layer after a predetermined time,
Preferably, the light output is terminated by the time the next scanning signal is sent.

Therefore, the light output layer can emit light in synchronization with the scanning timing. Thereby, there is an effect that an impulse type display can be realized.

Further, in the method for driving a light control element according to the present invention, it is preferable that a plurality of light output layers having different wavelengths are collectively emitted simultaneously.

As a result, there is an effect that the fabrication becomes easy and the number of ICs for controlling can be reduced.

Further, in the driving method of the light control element according to the present invention, it is preferable that the wavelength of the arranged light output is different between the adjacent light output layers, and further, the colors of the light output layers are R and G. , B are preferably repeated periodically.

As a result, color display without using a color filter can be performed, so that it is possible to increase light use efficiency and reduce power consumption.

As described above, according to the light control element and the method for driving the light control element according to the present invention, a liquid crystal display element that does not require a color filter can be manufactured, the light use efficiency can be improved, and the display efficiency can be improved. High brightness and low power consumption can be achieved.

Further, according to the light control element and the method of driving the light control element according to the present invention, it is possible to manufacture a high-brightness liquid crystal display device. Further, according to the driving method of the present invention, it is possible to realize a high-quality moving image display without tailing or contour blur.

[Brief description of the drawings]

FIG. 1A is a plan view showing a structure of a first light control element of the present invention, and FIG. 1B is a sectional view thereof.

FIG. 2A is a plan view showing a structure of a second light control element of the present invention, and FIG. 2B is a sectional view thereof.

FIG. 3 is a layout diagram of TFT driving elements in a display.

FIG. 4 is an explanatory diagram of an impulse type display according to a third embodiment of the present invention.

FIG. 5 is an explanatory diagram of an impulse type display according to a fourth embodiment of the present invention.

FIG. 6 is a sectional view showing a structure of a light control element according to a second embodiment of the present invention.

FIG. 7 is a sectional view showing the structure of a light control element according to a third embodiment of the present invention.

FIG. 8A is a plan view showing a structure of a light control element having a structure in which a light output layer is a repetition of RGB,
(B) is a sectional view thereof.

9A is a plan view showing a structure of a light control element having a structure different from that of FIG. 8 in which a light output layer has a repetition of RGB, and FIG. 9B is a cross-sectional view thereof.

FIGS. 10A to 10H are process diagrams showing a first method for manufacturing the light control element shown in FIG. 6;

FIGS. 11A and 11B are process diagrams showing steps after bonding substrates in the first method for manufacturing the light control element shown in FIG. 6;

12A to 12E are process diagrams showing a second method for manufacturing the light control element shown in FIG.

13 (a) to 13 (c) are process diagrams showing steps after laminating substrates in the second method for manufacturing the light control element shown in FIG. 6.

FIG. 14 is a cross-sectional view showing a laminated composite state of a liquid crystal display element portion and an organic EL display element portion in a conventional composite element display device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 2, 20 Substrate 3 Liquid crystal 4 Light output layer 5 Metal electrode 6 Light emitting layer 7 Transparent electrode 8 TFT 9 Gate electrode (scanning electrode) 10 Source electrode (signal electrode) 11 Counter electrode 12 Pixel electrode 13 Polarization functional layer 14 Polarizer 15 Alignment film 16 Optical waveguide 17 Light source

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G09G 3/20 680 G02F 1/1335 530

Claims (11)

[Claims] A first substrate on which at least one light output layer is disposed and a second substrate having a light transmitting function are opposed to each other, and a liquid crystal is interposed between the first substrate and the second substrate; Pinch,
An electrode for applying a plurality of scanning signals is formed on one of the first substrate and the second substrate, and an electrode for applying a plurality of signal electrodes is formed on one of the first substrate and the second substrate. The light control element according to claim 1, wherein the light output layers are arranged in a stripe shape, and the arrangement direction coincides with a direction of an electrode to which a scanning signal is applied. 2. A first substrate having at least one light output layer disposed thereon is opposed to a second substrate having a light transmitting function, and a liquid crystal is interposed between the first substrate and the second substrate. A plurality of active elements are formed on one of the first substrate and the second substrate, and a gate electrode for applying a plurality of scanning signals is formed on one of the first substrate and the second substrate. A source electrode for applying a plurality of signal electrodes is formed on one of the first substrate and the second substrate; the light output layers are arranged in a stripe; A light control element characterized in that: 3. The light control element according to claim 2, wherein said active element is formed on said second substrate. 4. The light control element according to claim 1, wherein a layer having a polarization function is formed on the first substrate. 5. The light output layer formed on the first substrate is constituted by a light emitting layer made of at least one of organic EL, inorganic EL, and FED light emitters. A first electrode film, the light emitting layer, and a second electrode film are formed in this order on a substrate, and the first electrode film and the second electrode film are formed in this order.
The light control element according to any one of claims 1 to 4, wherein the light emitting layer emits light when a voltage is applied between the electrode films. 6. The optical output layer formed on the first substrate is constituted by a combination of an optical waveguide and a light source coupled to the optical waveguide and arranged in a non-display area. The light control element according to any one of claims 1 to 4, wherein 7. The light control device according to claim 1, wherein the light emission time of the light output layer is not less than 5% and not more than 70% of each display frame time. Driving method of control element. 8. The light control element according to claim 1, wherein a light emission time of the light output layer is 15% or more and 40% or less of each display frame time. Driving method of control element. 9. The light control device according to claim 1, wherein after transmitting a scanning signal to each scanning line,
A method for driving a light control element, comprising: outputting a light from a light output layer after a predetermined time; and terminating the light output before a next scanning signal is transmitted. 10. The light control element according to claim 1, wherein the wavelengths of the plurality of light output layers are different between adjacent light output layers, and the light output of the different wavelengths is different. A method for driving a light control element, wherein a plurality of layers are collectively emitted simultaneously. 11. The light output layer according to claim 10, wherein the color of the plurality of light output layers is constituted by any one of R, G, and B, and the colors of R, B, and G are periodically repeated. Driving method of the light control element.